Other mistake: When Director Vance's wife shoots Kai from behind, the bullet passes through her, yet doesn't strike Vance, who is standing directly in front of the North Korean.
Other mistake: The body had multiple stab wounds on its back, but there was hardly any blood on the clothing. Even if the body was moved post-mortem, the clothing should have been saturated.
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.